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公开(公告)号：US06611775B1
公开(公告)日：2003-08-26
申请号：US09576719
申请日：2000-05-23
IPC分类号： G01F160
CPC分类号： G01D3/032 , G01D3/0365 , G01F1/58 , G01F1/60 , G01F25/0007
摘要： A magnetic flow meter has a diagnostic circuit that indicates leakage from flowtube electrodes. The diagnostic circuit couples to the electrodes and to ground. The diagnostic circuit samples diagnostic potentials between each electrode and ground, and then generates a sum of the diagnostic potentials between a first and a second electrode that indicates the leakage. The flowtube includes an insulated tube and an electromagnet. A transmitter circuit couples to the electromagnet and electrodes, and then generates a transmitter output representing a flow rate, which can be corrected for the leakage.
摘要翻译： 磁流量计具有指示来自流管电极的泄漏的诊断电路。 诊断电路耦合到电极和接地。 诊断电路对每个电极和地面之间的诊断电位进行采样，然后产生指示泄漏的第一和第二电极之间的诊断电位之和。 流量计包括绝缘管和电磁体。 发射器电路耦合到电磁体和电极，然后产生表示流量的发射器输出，其可以针对泄漏进行校正。
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公开(公告)号：US06611770B1
公开(公告)日：2003-08-26
申请号：US09578279
申请日：2000-05-25
IPC分类号： G01F158
CPC分类号： G01D3/032 , G01D3/0365 , G01F1/58 , G01F1/60 , G01F25/0007
摘要： A magnetic flowmeter with an improved liquid conduction indication has a flowtube assembly with a passage for liquid flow and has an electromagnet mounted outside the passage that provides ramped magnetic excitation. An electrode circuit couples through the passage and generates ramp spikes and a flow signal. A processor receiving the flow signal and generating a flow rate output. The processor also receives the ramp spikes and generates a filtered integral of the ramp spikes as a liquid conduction or empty pipe indication.
摘要翻译： 具有改进的液体传导指示的磁流量计具有流管组件，其具有用于液体流动的通道，并且具有安装在通道外部的电磁体，其提供斜坡磁激励。 电极电路通过通道耦合并产生斜坡尖峰和流动信号。 接收流量信号并产生流量输出的处理器。 处理器还接收斜坡尖峰，并产生斜坡尖峰的滤波积分作为液体导通或空管指示。
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公开(公告)号：US5426984A
公开(公告)日：1995-06-27
申请号：US116122
申请日：1993-09-02
摘要： An electromagnetic fluid flowmeter includes empty pipe detection circuitry. The empty pipe detection circuitry applies a common mode asynchronous signal into a pair of electrodes in the flowmeter. Impedance of fluid is determined by measuring the magnitude of the asynchronous signal between an electrode and electrical ground. Impedance is used to determine an empty pipe condition.
摘要翻译： 电磁流体流量计包括空管检测电路。 空管检测电路将共模异步信号施加到流量计中的一对电极中。 通过测量电极和电气接地之间的异步信号的大小来确定流体阻抗。 阻抗用于确定空管状态。
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公开(公告)号：US4594504A
公开(公告)日：1986-06-10
申请号：US530200
申请日：1983-09-08
CPC分类号： G02B6/266
摘要： A sensor which provides an output signal representative of a parameter such as pressure, includes a reflector, a lens and a waveguide which are relatively movable as a function of the parameter. Light from a light source is transmitted by the waveguide toward the reflector. The lens, which is positioned between the waveguide and the reflector directs the light from the waveguide to the reflector and focuses the reflected light proximate a receiving surface of the waveguide. A sensor housing supports the waveguide, lens and reflector so that a relative physical displacement between the waveguide, lens and reflector occurs which is responsive to the parameter. The light received by the waveguide at its receiving surface is a function of the relative physical displacement, and thus a function of the parameter. The waveguide transmits the received light to a light detector which produces an electrical output signal which is a function of the received light and therefore of the parameter.
摘要翻译： 提供表示诸如压力的参数的输出信号的传感器包括作为参数的函数可相对移动的反射器，透镜和波导。 来自光源的光通过波导向反射器透射。 位于波导和反射器之间的透镜将来自波导的光引导到反射器并将反射的光聚焦在波导的接收表面附近。 传感器壳体支撑波导，透镜和反射器，使得波导，透镜和反射器之间的相对物理位移响应参数而发生。 由波导在其接收表面处接收的光是相对物理位移的函数，并且因此是参数的函数。 波导将接收到的光传输到光检测器，该光检测器产生作为所接收的光的参数的函数的电输出信号。
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公开(公告)号：US5436824A
公开(公告)日：1995-07-25
申请号：US988716
申请日：1992-12-10
CPC分类号： H02H9/001 , G01F1/60 , Y10S323/908
摘要： An AC powered field mounted process control transmitter includes an inrush current limiter which prevents excessive current flow to other circuitry in the transmitter. The transmitter senses a physical parameter, such as flow, and comprises a source of current, a current driven sensing circuitry, the inrush current limiter and measurement electronics for converting the sensed parameter into a transmitter output. The limiter includes a reference voltage source and is in series between the current source and the current driven sensing circuitry. When inactive (i.e. not limiting current), the limiter responds to the series current through itself so that when such current exceeds a predetermined maximum level the limiter becomes active and prevents further current flow. The limiter remains active until the voltage across itself is less than the reference voltage, at which time the limiter becomes inactive.
摘要翻译： 交流电源现场安装的过程控制发射机包括浪涌电流限制器，其防止过大的电流流过发射机中的其它电路。 发射器感测物理参数，例如流量，并且包括电流源，电流驱动感测电路，浪涌电流限制器和用于将感测参数转换成发射机输出的测量电子装置。 限幅器包括参考电压源，并且串联在电流源和电流驱动感测电路之间。 当不活动（即不限制电流）时，限制器响应于自身的串联电流，使得当这种电流超过预定的最大电平时，限制器变为有效并且防止进一步的电流流动。 限制器保持有效，直到其自身的电压小于参考电压，此时限制器变为无效。
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公开(公告)号：US4545258A
公开(公告)日：1985-10-08
申请号：US510953
申请日：1983-07-05
申请人： Thomas P. Coursolle
发明人： Thomas P. Coursolle
摘要： An electrical circuit provides an output signal having a frequency representative of an input signal which has a fundamental frequency responsive to a parameter. The circuit has an amplifier having an adjustable amplitude response with an input coupled to the input signal and an output for providing the output signal as a function of the input signal. A filter is coupled to the amplifier and to the output signal for at least partially determining the amplitude response of the amplifier. The filter has an adjustable rolloff frequency characteristic. An adjustable impedance is coupled to the filter to adjust the amplitude response of the amplifier and adjust the rolloff frequency characteristic of the filter as a function of the input signal. A controller is coupled to the output signal and provides a control signal for adjusting the adjustable impedance and hence the amplitude response of the amplifier and the rolloff frequency characteristic of the filter as a function of the output signal.
摘要翻译： 电路提供具有表示具有响应于参数的基频的输入信号的频率的输出信号。 该电路具有具有可调幅度响应的放大器，其中输入耦合到输入信号，以及用于根据输入信号提供输出信号的输出。 滤波器耦合到放大器和输出信号，以至少部分地确定放大器的振幅响应。 滤波器具有可调节的滚降频率特性。 可调阻抗耦合到滤波器以调节放大器的振幅响应，并根据输入信号调整滤波器的滚降频率特性。 控制器耦合到输出信号，并提供控制信号，用于根据输出信号调整可调阻抗，因此调节放大器的幅度响应和滤波器的滚降频率特性。
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